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p in (-oo:+oo)
(-6/13)*p = -4 // + 4
(-6/13)*p+4 = 0
4-6/13*p = 0 // - 4
-6/13*p = -4 // : -6/13
p = -4/(-6/13)
p = 26/3
p = 26/3
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